Hi. After having low alkalinity and low PH for quite awhile, we fixed the alkalinity problem and have got the ph to normal levels. However, after running the filter we have green water and what looks to be orange residue all over the pool's sides and bottom. I am guessing this is corrosion particles cleaning out of the filter(?). It is kind of hard to get off. Does anyone know what we should do? Should we drain the pool and clean it with bleach? Should we use a product like "Metal Out" to help clean it up? We've already flushed the filter. We have a fiberglass pool. Any advice would be most welcome! Thank you.